[Drake] TR-7 24V Power Supply

[Joe Mann]

Sirs,

1 - 2 years ago I posted to the list(s) a problem that I was having with the
harmonics of the DC to DC inverter circuit when listening in the 0 - 500 kHz
band segment.  At least 1 head crash ago I lost the fix for this problem.
Its now time to actually do something about it.  As an aside, the TR-7
circuit description states the multivibrator runs @ 23 kHz; mine seems to be
much closer to 30 kHz.

I recall it involved the addition of an electrolytic across the ? volt
output of the PS board.  The PS board is the one with the CW/LSB/USB/RTTY
centering pots located at the front/right of the radio.  The connections
from the PS to the rest of the radio are accessible when the bottom plate is
removed and seems like the best place to put this additional bypass.

I also recall that the 3 legged voltage regulators on the PS board could use
additional bypassing.  Does anyone know what symptom that is fix attempting
to address?

I someone remembers the specifics, please send them along.

Joe, K9HDE
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